[Chapter XVIII—At the “Top of the World”]
The mystery of the “pink snows” is finally solved by Tom. A snowball battle above the clouds. On the peak of the High Sierras. The Overland Riders go to sleep in a snowbank. “Girls, this is an ideal summer resort.”
[Chapter XIX—Bowling in Nature’s Alley]
Hippy Wingate gives his companions a delightful surprise. The Overlanders withdraw their threat to throw him off the mountain. A mysterious lake is discovered. Emma Dean scores a hit. Bullets stop the highest bowling game on record.
[Chapter XX—Lead and Mystery in the Air]
Overland Riders suddenly find themselves under fire. Stacy “creeps” to safety. “Get up and walk, you tenderfoot!” The Aerial Lake lives up to its reputation. Woo Smith savvies trouble. “Discovered!” exclaims Hippy.
[Chapter XXI—The Face in the Waters]
The guide informs the Overlanders that a woman has been spying on the camp. Stacy feels like a snowbird. Prowlers leave a trail. Lieutenant Wingate meets with an unpleasant surprise. The pool of the mountain trout and what Grace Harlowe saw there.
[Chapter XXII—The Mystery of Aerial Lake]
Grace Harlowe flees from a hideous face. The Overland girls are eager to solve the mountain mystery. Stacy Brown discovers an “ark” and goes out for a sail. The fat boy mysteriously missing. Woo consults the skies. The lost boy returns with an appetite.